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On the many-time formulation of classical particle dynamics
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Starting from the standard one-time dynamics of n nonrelativistic particles, the n-time equations of motion are inferred, and a variational principle is formulated. A suitable generalization of the classical LieKnig theorem is demonstrated, which allows the determination of all the associated presymplectic structures. The conditions under which the action of an invariance group is canonical are studied, and a corresponding Noether theorem is deduced. A formulation of the theory in terms of n first-class constraints is recovered by means of coisotropic imbeddings. The proposed approach also provides for a better understanding of the relativistic particle dynamics, since it shows that the different roles of the physical positions and the canonical variables is not peculiar to special relativity, but rather to any n-time approach: indeed a nonrelativistic no-interaction theorem is deduced.
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LONGHI, Giorgio, LUSANNA, L., PONS RÀFOLS, Josep maria. On the many-time formulation of classical particle dynamics. _Journal of Mathematical Physics_. 1989. Vol. 30, núm. 1893. [consulta: 30 de gener de 2026]. ISSN: 0022-2488. [Disponible a: https://hdl.handle.net/2445/24565]